Redesigned thread safety mechanism - nua nua

Improve url scanner speed (up to 40% for large chunks of data)
and handle some corner cases better. The scanner has been changed
to the format as proposed in "RE2C - A More Versatile Scanner

Improve url scanner speed (up to 40% for large chunks of data)
and handle some corner cases better. The scanner has been changed
to the format as proposed in "RE2C - A More Versatile Scanner Generator"
by Cowan et al.

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Added new configuration directives:
arg_separator.input and arg_separator.output

- Fix copyright notices with 2001

Avoid possible memory leak in the URL scanner, if the connection is
interrupted during writing the output.

Make the generated <input> lower case and terminated with a /,
to be xhtml-compliant.

Support multi-char arg separators.

PR: #8274

Pass core_globals to new inline functions

Submitted by: Sebastian Bergmann

Move code from macros to inline functions to ease debugging

Reset the state, if there is garbage in an HTML tag.

PR: #7854

Validators are happy now.

Reinstantiate single quotes properly.

Add url_adapt_single_url() API which modifies a single URL. Might be used
to modify the Location: URL.

Hack for #7262, not fixed yet

Initialize tags properly.

Submitted by: Andreas Karajannis <Andreas.Karajannis@gmd.de>

Back out ws changes

make compile again

Enable users to set the HTML tags to rewrite
through a configuration directive

Ignore close tags and use unsigned char type.

Recognize single quotes around cdata.

Move smart_str functions to an extra file.

Unify memory allocation in smart_str functions

Cleanup SCANNER_DEBUG and don't NUL terminate work buffer

Use emalloc and friends. Since we reuse all buffers, this does not affect
the speed.

The smart_str_* functions don't NUL terminate strings anymore. We can
rely on the length of the s

Use emalloc and friends. Since we reuse all buffers, this does not affect
the speed.

The smart_str_* functions don't NUL terminate strings anymore. We can
rely on the length of the strings completely.

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Remove this pseudo optimization from the previous rewrite.

Since we leave/enter the loop more often, the cost of maintaining
c_arg/c_val is higher than simply copying the tag/arg string

Remove this pseudo optimization from the previous rewrite.

Since we leave/enter the loop more often, the cost of maintaining
c_arg/c_val is higher than simply copying the tag/arg string once.

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Another 5%-10% speed increase achieved by

- making ctx->val read-only
- adding a special appendc function for appending single characters

Add support for URLs containing NAME info (for scrolling; #name).